Senior Lead – VOIP Engineer

Sprinklr; Dublin; On-site; EUR 90,000 - 120,000; Full time

Job summary

A tech company in Dublin seeks a Sr Lead VOIP Engineer to spearhead the architecture and technical direction of their next-gen voice infrastructure. The successful candidate will design and implement VOIP systems with high availability and low latency while ensuring seamless communication in their CCaaS platform. This role requires extensive hands-on experience in Telephony and VoIP technologies, programming in C/C++, and leadership in establishing best practices across engineering teams.

Qualifications

• 12+ years of hands-on experience in the Telephony / VoIP / CPaaS domain.
• Expert-level understanding of SIP, RTP, and VoIP security.
• Strong programming skills in C/C++ for real-time systems.

Responsibilities

• Design and implement VOIP infrastructure.
• Lead initiatives for scalability and security of voice infrastructure.
• Collaborate with teams on provisioning and billing APIs.

Skills

Telephony / VoIP / CPaaS experience

VoIP Protocols knowledge

C/C++ development

Troubleshooting skills

Cloud-based deployments familiarity

Tools

FreeSWITCH

Kamailio

RTPEngine

Job description

Job Description

Sprinklr is the definitive, AI-native platform for Unified Customer Experience Management (Unified-CXM), empowering brands to deliver extraordinary experiences at scale — across every customer touchpoint.

By combining human instinct with the speed and efficiency of AI, Sprinklr helps brands earn trust and loyalty through personalized, seamless, and efficient customer interactions. Sprinklr’s unified platform provides powerful solutions for every customer-facing team — spanning social media management, marketing, advertising, customer feedback, and omnichannel contact center management — enabling enterprises to unify data, break down silos, and act on real-time insights.

Today, 1,900+ enterprises and 60% of the Fortune 100 rely on Sprinklr to help them deliver consistent, trusted customer experiences worldwide.

We are looking for a Sr Lead VOIP Engineer to lead the architecture and technical direction of our next‑gen voice infrastructure. You’ll be responsible for building carrier‑grade systems with high availability, low latency, and global scalability — powering mission‑critical voice communication in our CCaaS platform. This is a hands‑on leadership role where you will influence architecture, establish best practices, and work cross‑functionally across Engineering, DevOps, Product, and QA teams.

What You’ll Do

• Design and implement VOIP (signaling and media) infrastructure using FreeSWITCH, Kamailio / OpenSIPs, and RTPEngine.
• Architect session border controllers (SBC), NAT traversal, load balancing, and failover strategies.
• Define standards for call routing and audio quality optimization (codecs, jieer, etc.).
• Lead initiatives for scalability, observability, security, and resiliency of our voice infrastructure.
• Troubleshoot live traffic and provide technical leadership during major incidents.
• Collaborate with Backend and API teams to design provisioning, billing, and call analytics APIs.
• Evaluate and onboard open‑source tools or commercial carriers as needed.
• Coach and mentor junior/lead engineers in VoIP best practices.

What Makes You Qualified?

• 12+ years of hands‑on experience in the Telephony / VoIP / CPaaS domain.
• Strong knowledge of VoIP Protocols (SIP/SDP, RTP/RTCP), networking fundamentals. UDP/TCP/IP, DNS, MPLS, QoS (latency, jieer, packet loss migration).
• Hands‑on experience with Session Border Controller (SBC), media servers, and WebRTC.
• Expert‑level understanding of SIP, RTP, NAT traversal (ICE/STUN/TURN), and VoIP security (TLS, SRTP, fraud prevention).
• Hands‑on development experience with FreeSWITCH, Kamailio / OpenSIPs, and RTPEngine.
• Experience in designing carrier‑grade telephony platforms serving millions of calls.
• Strong systems programming and debugging skills in C/C++.
• Strong troubleshooting skills, with experience using network monitoring and debugging tools.
• Familiarity with distributed systems and cloud‑based deployments (AWS, GCP, Azure).
• Excellent problem‑solving, debugging, and performance tuning skills.

To Be Successful, You Must Have Hands‑On Experience In:

• C/C++ development for real‑time systems (not just architecture—active coding is required).
• VoIP protocols: SIP signaling, SDP negotiation, RTP/RTCP media handling.
• Media servers: FreeSWITCH, Kamailio/OpenSIPs, or RTPEngine.
• Carrier‑grade telephony infrastructure: SBCs, NAT traversal (ICE/STUN/TURN), and securing voice traffic with TLS/SRTP.
• Cloud contact center or CPaaS platforms, including PSTN/SIP trunking and global carrier integrations.

Sprinklr is proud to be an equal‑opportunity workplace and complies with all applicable federal, state, and local fair employment practices laws. We are committed to equal employment opportunity regardless of race, color, religion, creed, national origin, ethnicity, sex (including gender, pregnancy, sexual orientation, and gender identity), age, physical or mental disability, citizenship, past, current, or prospective service in the uniformed services, genetic information, or any other characteristic protected under applicable law. Reasonable accommodations are available upon request during the interview process. To request an accommodation, please work directly with your recruitment coordinator or recruiter.

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